sal-binding-broker-impl: classloader+javassist issue when registering NotificationListener

In case where the registrator class resides in different bundle as the listener implementation class, we get following exception while registering at:

org.opendaylight.controller.sal.binding.codegen.impl.AbstractRuntimeCodeGenerator.invokeFor():
RuntimeGeneratedInvoker.create(instance, prototype);

CannotCompileException: by java.lang.NoClassDefFoundError: org/opendaylight/controller/sal/binding/api/NotificationListener

Similar behavior was reported while reloading OFPlugin/samples/learning-switch bundle using osgi commands.